Supplementary Information

3D Walking Palm-like Core-Shell CoMoO4@NiCo2S4@Nickel Foam

Composite for High-performance Supercapacitors

Iftikhar Hussain a, Awais Alia, Charmaine Lamiel a, Saad Gomaa Mohamed a, b, Sumanta

Sahoo a, Jae-Jin Shima,*

a School of Chemical Engineering, Yeungnam University, Gyeongsan, Gyeongbuk 38541,

Republic of KoreabMining and Metallurgy Engineering Department, Tabbin Institute for Metallurgical Studies,

(TIMS), Tabbin, Helwan 109, Cairo 11421, Egypt

*Corresponding author: jjshim@yu.ac.kr (Prof. J.J. Shim)

Fig. S1 SEM images of walking palm-like core-shell CoMoO4@NiCo2S4@NF after 2 h of reaction

at low (a) and high (b) magnifications.

Electronic Supplementary Material (ESI) for Dalton Transactions.This journal is © The Royal Society of Chemistry 2019

Fig. S2 SEM images of CoMoO4@NF at low (a) and high (b) magnifications.

Fig. S3. TEM images of NiCo2S4 (a), CoMoO4 (b), and walking palm-like core-shell

CoMoO4@NiCo2S4 (c); and HRTEM image of walking palm-like core-shell

CoMoO4@NiCo2S4 (d).

Fig. S4 EDS spectra of CoMoO4@NF (a) and NiCo2S4@NF (b).

Fig. S5 XP spectra of the as-prepared NiCo2S4@NF: (a) survey, (b) Ni 2p, (c) Co 2p, and (d) S 2p.

Fig. S6 XP spectra of the as-prepared CoMoO4@NF: (a) survey, (b) Co 2p, (c) Mo 3d, and (d) O 1s.

Fig. S7 CV curves of (a) NiCo2S4@NF and (b) CoMoO4@NF at scan rates in the range of 5 to

100 mV s-1 and (c) CV curves based on active masses of electrode materials.

Fig. S8 GCD curves of NiCo2S4@NF (a) and CoMoO4@NF (b) at current densities in the range of

5 to 10 mA cm-1.

Fig. S9 Areal capacitances of CoMoO4@NiCo2S4@NF, NiCo2S4@NF, and

CoMoO4@NF at different current densities.

Fig. S10 Capacitance retention and coulombic efficiency of NiCo2S4@NF (a) and CoMoO4@NF (b)

for 10,000 cycles.

Fig. S11 CV curves of walking palm-like core-shell CoMoO4@NiCo2S4@NF (a) and

CoMoO4@NF (b) before the cycling test and after 10,000 cycles.

Fig. S12 SEM images of walking palm-like CoMoO4@NiCo2S4@NF before cycling (a) and after

10,000 cycles (b).

Fig. S13 XRD pattern of walking palm-like core-shell CoMoO4@NiCo2S4@NF after 10,000 cycles.

Fig. S14 (a) Schemetic diagram of the fabricated ASC device, (b) CV curves of the ASC device at

different scan rates.

Fig. 15 CV curves at different scan rates (a) and GCD curves at different current densities (b), both

for the NiCo2S4@NF//AC@NF ASC device; CV curves at different scan rates (c) and GCD

curves at different current densities (d), both for the CoMoO4@NF//AC@NF ASC device.

Fig. S16 Areal capacitances of NiCo2S4@NF//AC@NF and CoMoO4@NF//AC@NF

ASC devices at different current densities.

Table S1. Comparison for energy and power densities of different NiCo2S4 and CoMoO4

asymmetric supercapacitor device

Ca: Areal capacitance, ED: Energy density, PD: Power density

S1. M. L. Yan, Y. D. Yao, J. Q. Wen, L. Long, M. L. Kong, G. G. Zhang, X. M. Liao, G. F.

Yin and Z. B. Huang, ACS Appl. Mater. Interfaces, 2016, 8, 24525-24535.

S2. Y. Y. Huang, T. L. Shi, S. L. Jiang, S. Y. Cheng, X. X. Tao, Y. Zhong, G. L. Liao and Z.

R. Tang, Sci. Rep-Uk, 2016, 6.

S3. Liu, X., Wu, Z., Yin, Y., Chem. Eng. J., 2017, 323, 330-339.

S4. Z. Q. Zhang, H. D. Zhang, X. Y. Zhang, D. Y. Yu, Y. Ji, Q. S. Sun, Y. Wang and X. Y.

Liu, J. Mater. Chem. A, 2016, 4, 18578-18584.

Supercapacitor device Electrolyte

Potential window

(V)

Ca,(F cm-2)

ED(Wh kg-1)

PD at max ED

(kW kg-1)

Ref. No.

NiCo2S4@PPy//AC

3M KOH 0 to 1.6 3.24at 5 mA cm-2

34.6 0.12 S1

NiCo2S4@NiO//AC

3M KOH 0 to 1.6 0.59at 2 mA cm-2

30.3 0.28 S2

NiCo2S4@PANI// Graphene

6M KOH 0 to 1.6 2.1at 5 mA cm-2

64.9 0.27 S3

CoMoO4@NiMoO4//AC

2M KOH 0 to 1.6 NA 28.7 0.26 S4

NiCo2S4//AC 3M KOH 0 to 1.6 0.35at 5 mA cm-2

22.5 0.73 Thiswork

CoMoO4//AC 3M KOH 0 to 1.6 0.29at 5 mA cm-2

19.0 0.72 Thiswork

CoMoO4@NiCo2S4//AC

3M KOH 0 to 1.6 4.18at 5 mA cm-2

60.2 0.18 Thiswork